Do you mean "estrogens" and adrenaline? recent research associated the presence of ovaries with a decreased incidence of parkinson's in women, concluding that estrogen must have a protective effect from onset of parkinson's .

http://psychcentral.com/news/2007/08...risk/1215.html
Estrogen Therapy Lowers Parkinson Risk
By Rick Nauert, Ph.D.
Senior News Editor
"...Before age 50, estrogen replacement therapy may, in fact, be beneficial for the brain function of women who have their ovaries removed. This large study involved reviews of medical records and follow-up interviews with approximately 4,600 women.

Prior to this Mayo Clinic report, there was limited or conflicting clinical and epidemiological evidence about estrogen’s ability to protect brain functioning in women, referred to as neuroprotection.

The Mayo research results show that not only did women who had one or both ovaries removed before menopause have an increased risk for Parkinson’s disease or parkinsonism compared to other women, but that the risk increased the younger the woman was at ovary removal..."

You may read about "endorphins" here:
http://en.wikipedia.org/wiki/Endorphin

The endocrine system, of which all these compounds are a part, is an intricate system with many complex feed-back mechanisms--I suspect many women with parkinson's could validate your experience of such variation and intensification of symptoms with their menstral cycle.